def test1(self):
R = """\
t-Test: One Sample for means
SUPPRESSION
=====================================
Sample Mean 19.541
Hypothesized Pop. Mean 17
Variance 228.326
Observations 384
df 383
t Stat 3.295
alpha 0.050
P(T<=t) one-tail 5.384e-04
t Critical one-tail 1.966
P(T<=t) two-tail 0.001
t Critical two-tail 1.649
P(T<=t) two-tail 0.001
Effect size d 0.168
delta 3.295
Observed power one-tail 0.950
Observed power two-tail 0.908 """
df = DataFrame()
df.read_tbl('data/suppression~subjectXgroupXageXcycleXphase.csv')
D = df.ttest('SUPPRESSION', pop_mean=17.)
self.assertEqual(str(D), R)
def test4(self):
R = """t-Test: Paired Two Sample for means
PRE POST
=============================================
Mean 87.250 87.083
Variance 1207.659 1166.629
Observations 12 12
Pearson Correlation 0.995
df 11
t Stat 0.163
alpha 0.050
P(T<=t) one-tail 0.437
t Critical one-tail 2.201
P(T<=t) two-tail 0.873
t Critical two-tail 1.796
P(T<=t) two-tail 0.873
Effect size dz 0.047
delta 0.163
Observed power one-tail 0.068
Observed power two-tail 0.035 """
df = DataFrame()
df.read_tbl('data/example2_prepost.csv')
D = df.ttest('PRE', 'POST', paired=True)
self.assertEqual(str(D), R)
